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SUMMARY:Limitations of the Diffusion Approximation for GCR Transport
DTSTART;VALUE=DATE-TIME:20261030T144500Z
DTEND;VALUE=DATE-TIME:20261030T150000Z
DTSTAMP;VALUE=DATE-TIME:20261102T233311Z
UID:indico-contribution-6222@cern.ch
DESCRIPTION:Speakers: Vladimir Yurovsky (Lomonsov MSU)\nModern experiments
  provide a wealth of new data and reveal many new\, still unexplained phen
 omena. To explain them\, one needs a deep understanding of Galactic cosmic
  ray (GCR) transport\, which is usually assumed to be diffusive. Many stud
 ies construct predictive models within different variants of this approach
  and achieve valuable results in explaining observed GCR spectra. However\
 , the validity of this approximation has not been rigorously proven.\n\nIn
  this work\, we study the microscopic transport of ultra-relativistic part
 icles. Test-particle simulations are performed for different configuration
 s of a model magnetic field. From the obtained trajectories\, we extract t
 he statistical properties of charged-particle reflections from magnetic fi
 eld inhomogeneities. A data collapse of the joint distribution of reflecti
 on parameters is obtained using a self-similarity ansatz. The marginal pat
 h-length distribution exhibits intermediate power-law asymptotic behavior 
 with an exponential cutoff. A strong correlation between particle displace
 ments and path length also emerges. These results indicate that the diffus
 ion approximation is applicable only at scales larger than the exponential
  cutoff\, whereas at smaller scales the transport exhibits strong signatur
 es of anomalous behavior.\n\nhttps://indico.particle.mephi.ru/event/626/co
 ntributions/6222/
LOCATION: Conference Hall 4
URL:https://indico.particle.mephi.ru/event/626/contributions/6222/
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